APA
Wijesekera R., Ratnatunga C. & Durbeck K. (1997). The Distillation of Essential oils. : Protrade: Dept Foodsruffs and Agricultural Products.
Chicago
Wijesekera R.O.B, Ratnatunga C.M and Durbeck Klaus. 1997. The Distillation of Essential oils. : Protrade: Dept Foodsruffs and Agricultural Products.
Harvard
Wijesekera R., Ratnatunga C. and Durbeck K. (1997). The Distillation of Essential oils. : Protrade: Dept Foodsruffs and Agricultural Products.
MLA
Wijesekera R.O.B, Ratnatunga C.M and Durbeck Klaus. The Distillation of Essential oils. : Protrade: Dept Foodsruffs and Agricultural Products. 1997.